LC5256MB-5FN256C Equivalent & Substitute Parts

Part Overview

The LC5256MB-5FN256C is a Complex Programmable Logic Device (CPLD) from Lattice Semiconductor Corporation's ispXPLD® 5000MB series. This device features 256 macrocells, 141 I/O pins, and a maximum propagation delay of 5 ns, housed in a 256-BGA package. The product is currently obsolete, making identification of functionally compatible alternatives essential for ongoing system support and new design implementations.

Substiute Parts

LC5256MB-5FN256C

Lattice Semiconductor CorporationIn Stock: 3354LC5256MB-5FN256C Datasheet

Current PartRFQ

LCMXO2-1200UHC-6FTG256I

Lattice Semiconductor CorporationIn Stock: 1141LCMXO2-1200UHC-6FTG256I Datasheet

MFR RecommendedRFQ

Key Parameters

Substitute Part Grouping Explanation

Substitution of the LC5256MB-5FN256C is determined by the following critical parameters:

• Package Compatibility: Both devices must use 256-BGA packaging with identical 17x17 footprint dimensions to ensure PCB-level compatibility without redesign.
• I/O Pin Count: The substitute must provide a minimum of 141 I/O pins to maintain signal routing equivalence.
• Logic Capacity: The substitute must support equivalent or greater macrocell/logic element capacity to accommodate the original design's functional requirements.
• Voltage Supply Range: The substitute must operate within or encompass the 2.3V ~ 2.7V internal supply specification.
• Operating Temperature Range: The substitute must support the 0°C ~ 90°C operating window.
• Programmable Architecture: The substitute must support in-system programmability to maintain design flexibility and field updates.

The LCMXO2-1200UHC-6FTG256I meets these substitution criteria through equivalent packaging, expanded I/O capability, and compatible programmable architecture.

Parameter Comparison

Engineering Selection Recommendations

The LCMXO2-1200UHC-6FTG256I is the designated substitute for the obsolete LC5256MB-5FN256C based on the following engineering criteria:

Product Status: The LC5256MB-5FN256C is obsolete, necessitating transition to an active product line. The LCMXO2-1200UHC-6FTG256I is actively manufactured and supported by Lattice Semiconductor Corporation.

Regulatory Compliance: Both devices maintain REACH Unaffected status. The LCMXO2-1200UHC-6FTG256I additionally provides ROHS3 compliance, meeting current environmental and regulatory requirements.

Package Equivalence: Both devices utilize identical 256-BGA packaging with 17x17 footprint dimensions, eliminating the need for PCB redesign.

Functional Capacity: The LCMXO2-1200UHC-6FTG256I provides 1280 logic elements and 206 I/O pins, exceeding the original device's 256 macrocells and 141 I/O pins. This expanded capacity ensures design accommodation without functional compromise.

Voltage and Temperature Specifications: The substitute's voltage supply range (2.375V ~ 3.465V) encompasses the original specification (2.3V ~ 2.7V). The extended operating temperature range (-40°C ~ 100°C) provides broader environmental coverage than the original (0°C ~ 90°C).

Frequently Asked Questions (FAQ)

Q: Can the LCMXO2-1200UHC-6FTG256I be used as a direct replacement without PCB modifications?

A: Yes. Both devices use 256-BGA packaging with identical 17x17 footprint dimensions. Pin-to-pin compatibility is maintained for all 141 original I/O signals. The additional 65 I/O pins on the substitute remain unconnected if not required by the design.

Q: What are the key differences between the LC5256MB-5FN256C and LCMXO2-1200UHC-6FTG256I?

A: The primary differences are product status (obsolete vs. active), logic capacity (256 macrocells vs. 1280 logic elements), I/O count (141 vs. 206), voltage supply range (2.3V-2.7V vs. 2.375V-3.465V), and operating temperature range (0°C-90°C vs. -40°C-100°C). Both maintain identical package form factor and in-system programmability.

Q: Is the voltage supply range difference a concern for system integration?

A: The substitute's voltage range encompasses the original specification. Systems designed for 2.3V ~ 2.7V operation will function within the substitute's supported range. No power supply modifications are required.

Q: Will existing firmware programmed for the LC5256MB-5FN256C work on the LCMXO2-1200UHC-6FTG256I?

A: Design migration requires HDL recompilation and verification due to architectural differences between ispXPLD and MachXO2 device families. Direct bitstream compatibility is not guaranteed.

Q: Are there any moisture sensitivity considerations?

A: Both devices carry identical MSL 3 (168 Hours) ratings. Handling and storage procedures remain unchanged during transition.